Hello Bubu Prasant, I think it's wrong to think of each line as being in one or the other metre. Remember Wordsworth's comment about 'the language really used by men' in the preface to the Lyrical Ballads. 'The principal object, then, proposed in these Poems was to choose incidents and situations from common life, and to relate or describe them, throughout, as far as was possible in a selection of language really used by men' I know that The Solitary Reaper was written after the publication of the Lyrical Ballads, but it's written very much in their spirit as laid out in the preface.
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